streamline /ˈstriːmlaɪn/verb 3noun 2forms 3 verb3 •To design and construct the contours of a vehicle etc. so as to offer the least resistance to its flow through a fluid. •To simplify or organize a process in order to increase its efficiency.The subcommittee concludes FDA should become less involved in the early stages of clinical research by streamlining and uncumbering its regulations governing them. — 1980 •To modernize. noun2 •A line that is tangent to the velocity of flow of a fluid; equivalent to the path of a specific particle in that flow. •On a weather chart, a line that is tangent to the flow of the wind. formsstreamlined · streamlining · streamlines